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Troubleshooting Overview 9-3
9
9.2.1 System Front Panel LEDs
LEDs in the system are controlled by OpenBoot™ PROM programming (OBP).
Table 9-1 lists the LED codes for system operations.
9.2.2 Clock Board LEDs
The clock board also displays system status. The LED codes are the same as for
the front panel. See Table 9-1.
9.2.3 CPU/Memory and I/O Board LEDs
For hot-pluggable boards, most of the LED codes correspond to those shown in
Table 9-1. The most important exception is the second code (Off-On-Off). For
hot-pluggable boards, Off-On-Off indicates that the board is in low-power
mode and is ready for removal.
Table 9-1 System Status Codes
Power Service Cycling
Condition
Off Off Off No power or the key switch is in the Off position.
Off On Off Failure mode. System has electrical power.
Off Off On Failure mode. System has electrical power.
Off On On Failure mode. System has electrical power.
On Off Off System is hung, either in POST/OBP or in the
operating system.
On Off On Hung in OS.
On On Off (Hung in POST/OBP) or (hung in OS and failed
component in system).
On On On (Hung in POST/OBP) or (hung in OS and failed
component in system).
On Off Flashing OS running. System is operating normally.
On On Flashing OS running and failed component in system.
On Flashing Off Slow flash = POST. Fast flash = OBP.
On Flashing On OS or OBP error.